Valve-gear



(No Model.)

' W. W.-LOVELL.

VALVE GEAR. N0. 265,682. Patented 001;. 10, 1882.

@JCM774 m:-

UNITE STATES PATENT OFFICE.

WILLIAM W. LOVELL, ()F RACINE, WISCONSIN.

VALVE-GEA R.

SPECIFICATION forming part of Letters Patent No. 265,682, dated October10, 1882.

Application filed January 12, 1881. (No model.)

T 0 all whom it may concern Be it known that I, WILLIAM W. LOVELL, ofthe city of Racine, in the county of Racine and State of Wisconsin, haveinvented certain new and useful Improvements in Reversing Devices inSteam-Engine Valve-Gear 5 and I do hereby declare that the following isa full, clear, and exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to reversing'mechanism in valve-gear ofsteam-engines. It is more particularly intended and adapted for portableand the lighter class of stationary engines; and it consists essentiallyin the combination, with the valve eccentric provided with asuitably-limited free rotative movement on the crankshaft, of anarrangement of gearwheels properly mounted, or of equivalent mechanism,whereby the engineer or operator may from a convenient point shift theeccentrio and the valves actuated therefrom, and so reverse the mptionof the engine.

In the drawings, Figure l is a plan of an engine valve-gear providedwith my improvement, and Fi g. 2 is a vertical section through :0 m ofFig. 1.

The same letter indicates the same part in both figures of the drawings.

A represents the crank-shaft, having the crank 0 connected in the usualmanner with the piston-rod. B is the valve-eccentric, and D is the shaftconnecting the valve-rod with the eccentric. Said eccentric B, insteadof being made rigid with the crank-shaft A, as commonly done, is fittedto havea free rotative movement of about one-third turn on saidcrank-shaft. For this purpose the eccentric is provided with a hub, B,of suitable length to give proper steadiness to the eccentric, and therotary movement-of the eccentric upon the crank-shaft is limited by anyappropriate arrangements of stops. Such stops are herein shown toconsist of the pin F, set in the crankshaft A, and the shoulders s s,formed by cutting away the eccentric hub at one end for a suitabledistance, as shown more clearly in Fig.2. It is understood of coursethat the crank-shaft carries the eccentric by contact of the pin F withone of the shoulders s, according to the direction in which said shaftis turning, and said pin and shoulders or stops are so arranged withreference to the eccentric and crank as to give the necessary or desiredlead to the valves whichever way the engine be running. A reversal ofthe engine motion will be effected by shifting the eccentric on theshaft, so as to change the bearing of the pin F from one shoulder s tothe other. For the purpose of enabling the operator to make this shift 1have provided the following devices:

G is a beveled pinion, cast or keyed on the hub B of the eccentric B.

H is a beveled spur meshing with G and fixed and supported on the shaftI, mounted in suitable bearings, L, and extended backward or otherwiseto a point on the machine convenient to the engineer, where it isprovided with a hand-wheel, J. Said shaft is in motion when the engineis running.

To reverse the engine by the means described, steam is first shut 0d thevalve-chest, and when the speed is slowed or stopped the wheel J isturned by the engineer to shift the eccentric on the crank-shaft andbring the hitherto-disengaged shoulder sin bearin g with the pin F. Bythis rotation of the eccentric B the valves actuated therefrom are alsoshifted with reference to the piston and crank O, and steam being againlet on the motion of the crank-shaft will be reversed. If the reversalis attempted without shutting off steam entirely ceased, the wheel Jwill need to be turned at an accelerated speed in the direction in whichit will in that case be running to bring the proper stop 8 in contactwith the pin F, and power will of course need to be continued in orderto hold the eccentric in such bearin g with said pin until thecrankshaft reverses.

Other arrangements of gear may obviously be employed in place of thebeveled meshwheels Gr H and shaft I, and the wheel J, which is seized bythe operator, may be given any desired rate of relative speed bygear-wheels of proper number or relative size at either end -of theshaft I.

I claim as my invention- The combination of the crank-shaft A,having-the pin F, the loose eccentric B, having entirely, or before themotion of the engine has stops 8 s, the beveled-gear pinion G, rigidwith said eccentric, and the shaft I, provided with the beveled-gearwheel H, meshing with the pinion G, and the hand-wheel J, together ar- 5ranged and operating substantially as described, and for the purposesset forth.

In testimony that I claim the foregoing as w my invention I affix mysignature in presence of two witnesses.

WILLIAM W, LOVELL.

Witnesses:

A. CARY J UDD, GEO. B; JUDD,

